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import type {DateTime} from '@gravity-ui/date-utils';
import {useControlledState, useLang} from '@gravity-ui/uikit';
import type {InputBase, Validation, ValueBase} from '../../types';
import {createPlaceholderValue, isInvalid} from '../../utils/dates';
import {useDefaultTimeZone} from '../../utils/useDefaultTimeZone';
import {IncompleteDate} from '../IncompleteDate';
import type {DateFieldSectionWithoutPosition} from '../types';
import {
addSegment,
adjustDateToFormat,
getEditableSections,
getFormatInfo,
parseDateFromString,
setSegment,
useFormatSections,
} from '../utils';
import {useBaseDateFieldState} from './useBaseDateFieldState';
import type {DateFieldState} from './useBaseDateFieldState';
export interface DateFieldStateOptions extends ValueBase<DateTime | null>, InputBase, Validation {
/** The minimum allowed date that a user may select. */
minValue?: DateTime;
/** The maximum allowed date that a user may select. */
maxValue?: DateTime;
/** Callback that is called for each date of the calendar. If it returns true, then the date is unavailable. */
isDateUnavailable?: (date: DateTime) => boolean;
/** Format of the date when rendered in the input. [Available formats](https://day.js.org/docs/en/display/format) */
format?: string;
/** A placeholder date that controls the default values of each segment when the user first interacts with them. Defaults to today's date at midnight. */
placeholderValue?: DateTime;
/**
* Which timezone use to show values. Example: 'default', 'system', 'Europe/Amsterdam'.
* @default The timezone of the `value` or `defaultValue` or `placeholderValue`, 'default' otherwise.
*/
timeZone?: string;
/** Custom parser function for parsing pasted date strings. If not provided, the default parser will be used. */
parseDateFromString?: (dateStr: string, format: string, timeZone?: string) => DateTime;
}
export function useDateFieldState(props: DateFieldStateOptions): DateFieldState {
const [value, setDate] = useControlledState(
props.value,
props.defaultValue ?? null,
props.onUpdate,
);
const inputTimeZone = useDefaultTimeZone(
props.value || props.defaultValue || props.placeholderValue,
);
const timeZone = props.timeZone || inputTimeZone;
const handleUpdateDate = (v: DateTime | null) => {
setDate(v ? v.timeZone(inputTimeZone) : v);
};
const [lastPlaceholder, setLastPlaceholder] = React.useState(props.placeholderValue);
Iif (
(props.placeholderValue && !props.placeholderValue.isSame(lastPlaceholder)) ||
(!props.placeholderValue && lastPlaceholder)
) {
setLastPlaceholder(props.placeholderValue);
}
const placeholder = React.useMemo(
() =>
createPlaceholderValue({
placeholderValue: lastPlaceholder,
timeZone,
}),
[lastPlaceholder, timeZone],
);
const format = props.format || 'L';
const sections = useFormatSections(format);
const formatInfo = React.useMemo(() => getFormatInfo(sections), [sections]);
const allSegments = formatInfo.availableUnits;
const [displayValue, setDisplayValue] = React.useState(() => {
return new IncompleteDate(value && value.isValid() ? value.timeZone(timeZone) : null);
});
const [lastValue, setLastValue] = React.useState(value);
const [lastTimezone, setLastTimezone] = React.useState(timeZone);
if (
(value && !value.isSame(lastValue)) ||
(value && lastTimezone !== timeZone) ||
(value === null && lastValue !== null)
) {
setLastValue(value);
setLastTimezone(timeZone);
setDisplayValue(new IncompleteDate(value?.timeZone(timeZone)));
}
const {lang} = useLang();
const dateValue = React.useMemo(() => {
return displayValue
.toDateTime(value?.timeZone(timeZone) ?? placeholder, {
setDate: formatInfo.hasDate,
setTime: formatInfo.hasTime,
})
.locale(lang);
}, [displayValue, value, placeholder, formatInfo, timeZone, lang]);
const sectionsState = useSectionsState(sections, displayValue, dateValue);
const [selectedSections, setSelectedSections] = React.useState<number | 'all'>(-1);
const selectedSectionIndexes = React.useMemo<{
startIndex: number;
endIndex: number;
} | null>(() => {
if (selectedSections === -1) {
return null;
}
if (selectedSections === 'all') {
return {
startIndex: 0,
endIndex: sectionsState.editableSections.length - 1,
};
}
Eif (typeof selectedSections === 'number') {
return {startIndex: selectedSections, endIndex: selectedSections};
}
if (typeof selectedSections === 'string') {
const selectedSectionIndex = sectionsState.editableSections.findIndex(
(section) => section.type === selectedSections,
);
return {startIndex: selectedSectionIndex, endIndex: selectedSectionIndex};
}
return selectedSections;
}, [selectedSections, sectionsState.editableSections]);
function setValue(newValue: DateTime | IncompleteDate | null) {
Iif (props.disabled || props.readOnly) {
return;
}
Iif (
newValue === null ||
(newValue instanceof IncompleteDate && newValue.isCleared(allSegments))
) {
setDate(null);
setDisplayValue(new IncompleteDate());
} else if (newValue instanceof IncompleteDate) {
if (newValue.isComplete(allSegments)) {
const newDate = newValue.toDateTime(dateValue, {
setDate: formatInfo.hasDate,
setTime: formatInfo.hasTime,
});
if (newValue.validate(newDate, allSegments)) {
Eif (!value || !newDate.isSame(value)) {
handleUpdateDate(adjustDateToFormat(newDate, formatInfo));
}
}
}
setDisplayValue(newValue);
} else if (!value || !newValue.isSame(value)) {
handleUpdateDate(newValue);
}
}
function setSection(sectionIndex: number, amount: number) {
const section = sectionsState.editableSections[sectionIndex];
Eif (section) {
setValue(setSegment(section, displayValue, amount, dateValue));
}
}
function adjustSection(sectionIndex: number, amount: number) {
const section = sectionsState.editableSections[sectionIndex];
Eif (section) {
setValue(addSegment(section, displayValue, amount, dateValue));
}
}
function getSectionValue(_sectionIndex: number) {
return displayValue;
}
function setSectionValue(_sectionIndex: number, newValue: IncompleteDate) {
setValue(newValue);
}
function setValueFromString(str: string) {
const parseDate = props.parseDateFromString ?? parseDateFromString;
const date = parseDate(str, format, timeZone);
Eif (date.isValid()) {
setValue(date);
return true;
}
return false;
}
function confirmPlaceholder() {
Iif (props.disabled || props.readOnly) {
return;
}
// If the display value is complete but invalid, we need to constrain it and emit onChange on blur.
Eif (displayValue.isComplete(allSegments)) {
const newValue = displayValue.toDateTime(dateValue, {
setDate: formatInfo.hasDate,
setTime: formatInfo.hasTime,
});
setValue(adjustDateToFormat(newValue, formatInfo, 'startOf'));
}
}
const validationState =
props.validationState ||
(isInvalid(value, props.minValue, props.maxValue) ? 'invalid' : undefined) ||
(value && props.isDateUnavailable?.(value) ? 'invalid' : undefined);
return useBaseDateFieldState({
value,
displayValue: dateValue,
placeholderValue: props.placeholderValue,
timeZone,
validationState,
editableSections: sectionsState.editableSections,
formatInfo,
readOnly: props.readOnly,
disabled: props.disabled,
selectedSectionIndexes,
selectedSections,
isEmpty: displayValue.isCleared(allSegments),
setSelectedSections,
setValue,
adjustSection,
setSection,
getSectionValue,
setSectionValue,
setValueFromString,
confirmPlaceholder,
});
}
function useSectionsState(
sections: DateFieldSectionWithoutPosition[],
value: IncompleteDate,
placeholder: DateTime,
) {
const [state, setState] = React.useState(() => {
return {
value,
sections,
placeholder,
editableSections: getEditableSections(sections, value, placeholder),
};
});
if (sections !== state.sections || placeholder !== state.placeholder || value !== state.value) {
setState({
value,
sections,
placeholder,
editableSections: getEditableSections(sections, value, placeholder),
});
}
return state;
}
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